US10704581B2 - Press-in fastener with a wavy knurled shank - Google Patents

Press-in fastener with a wavy knurled shank Download PDF

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Publication number
US10704581B2
US10704581B2 US16/185,048 US201816185048A US10704581B2 US 10704581 B2 US10704581 B2 US 10704581B2 US 201816185048 A US201816185048 A US 201816185048A US 10704581 B2 US10704581 B2 US 10704581B2
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Prior art keywords
fastener
rows
shank
knurls
row
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US16/185,048
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US20190145450A1 (en
Inventor
Brian G. Bentrim
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Penn Engineering and Manufacturing Corp
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Penn Engineering and Manufacturing Corp
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Priority to US16/185,048 priority Critical patent/US10704581B2/en
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Assigned to JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT reassignment JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HEYCO PRODUCTS CORP., PEM MANAGEMENT, INC., PENN AUTOMOTIVE, INC., PENN ENGINEERING & MANUFACTURING CORP.
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/02—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose in one piece with protrusions or ridges on the shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B4/00—Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits; Non-releasable friction-grip fastenings
    • F16B4/004—Press fits, force fits, interference fits, i.e. fits without heat or chemical treatment

Definitions

  • the present invention is related to press-in fasteners of the type which force-fit into the aperture of a receiving object such as a panel. More specifically, it relates to fasteners of this type that have features on their shanks to enhance the engagement with a receiving object to increase the fastener's pull-out resistance.
  • Press-in fasteners such as the TackSert® fastener product line of Penn Engineering & Manufacturing Corp. have diagonal knurls. These pins can be installed into either brittle or soft material by pushing the head and allowing the knurls to enter the host material. During this installation one or a combination of two things happens: the knurls cut and dig into a more brittle host or the knurls push aside a more malleable host.
  • the knurls will cut the host and pack the cut material into the knurl teeth creating a press-fit situation to create a tight bond between the pin and the host material. Because this packed material represents already cut and weakened pieces, the retention force is adversely affected. In a more ductile and malleable host, the displacement force pushing inward axially can fold-over and plow ahead the host instead of allowing it to flow around the knurl.
  • the present fastener has been devised which incorporates a compound wave pattern into the shank knurl.
  • This knurl configuration reduces the installation force and disruption of the host material while maintaining a better lock on the host material after installation.
  • the knurl pattern is generally aligned in longitudinal rows along either a straight or a serpentine path.
  • the row of knurls alternate in width from a narrow to a wider arcuate cross-section as the rows transverse axially along the length of the fastener shank. They also can have a wavy pattern with peaks and valleys in the longitudinal plane. This compound wavy configuration in perpendicular planes of the knurls yields a number of benefits without adversely affecting the manufacturing process.
  • a fastener having a top, a bottom, and a central longitudinal axis.
  • the fastener has from the top to the bottom in this order: a head at the top being the largest diameter of the fastener; a shank extending immediately downward from the head, said shank having a plurality of knurls extending radially therefrom; and wherein the knurls are arranged in a plurality of rows, each row following either a straight or serpentine longitudinal path.
  • the rows are equally spaced radially around a circumference of the shank with at least one of said rows of knurls having a wavy cross-sectional profile that lies in the longitudinal plane containing the longitudinal axis.
  • the profile can consist of a series of contiguous alternating arcuate peaks and arcuate valleys.
  • each row of knurls is not straight but defined by a serpentine string of knurls with arcuate sides that radially project from the generally cylindrical shank of the fastener.
  • the individual knurls of a row of knurls may be joined by arcuate narrowed sections that follow a longitudinal serpentine path.
  • At least one of said rows also has a wavy cross-sectional profile in a lateral plane of the row perpendicular to said longitudinal plane.
  • the fastener may have rows of knurls that extend substantially the entire length of the fastener shank and the rows of knurls can be longitudinally staggered such that the peaks of one row are in axial alignment with the valleys of adjacent rows.
  • rows of splines follow a longitudinal zig-zag path.
  • all the rows are about the same radial height, each row having a triangular profile with a base and a peak defining the maximum height of the row.
  • the knurl configurations described above provide a front-face of the knurl that moves the material forward and a rear-face of the knurl that allows the material to relax or move back into the cavity created behind the knurl.
  • the wavy knurl minimizes the sheared area in a similar manner to what is done with a straight (vertical) knurl.
  • each knurl cuts down directly in one shear line that does not impact adjacent shear lines.
  • the brittle material is cut and sawn through with the repeated ridges moving into the host.
  • the single shear line is parted and spread by the angular walls of the knurl which while resisting the parting action place high friction loads onto the sides of the knurls.
  • the host material will respond with a sharp crack.
  • these frictional forces are all that keep the knurl in the host material.
  • the wave provides a mechanical interference along the axis of the wave due to the varying cross-section of the wave.
  • the symmetric shape of the wave ensures that the forces are balanced, but the changing cross-section induces a force to resist the axial pull-out.
  • the host material have some elasticity, and is not perfectly brittle or perfectly plastic, for as the front-face of the wave knurl is pushed into the host, any elasticity will cause some closure of the host behind along the trailing-face of the knurl.
  • the wavy knurls performs much in the same way, but here, instead of cutting into the host, the host is pushed aside in an elastic or plastic manner. Any elastic behavior will cause the same forces as described above with regard to brittle host materials. However instead of a crack, the ductile material will demonstrate a curved response at the crest of the knurl. The straight and wave knurl have an advantage again over the diagonal or diamond knurl.
  • the host must respond by moving out of the way and filling in behind as the each knurl in sequence as it passes causing a work-hardening or embrittling of the host weakening its response with each passing across the install.
  • FIG. 1 is a bottom left perspective view.
  • FIG. 2 is an elevation view of the embodiment of FIG. 1 .
  • FIG. 3 is a bottom right perspective view of an alternate embodiment.
  • FIG. 4 is an elevation view of an alternate embodiment.
  • FIG. 5 is a sectional view taken from FIG. 4 as shown in that Figure.
  • FIGS. 6 and 7 are sectional views taken from FIG. 5 as shown in the Figure.
  • FIG. 8 is a section view of an alternate embodiment.
  • the terms “high” and “low” refer to the height of the knurl as measured from the longitudinal axis of the fastener shank along a longitudinal plane of the shank, the low points of the knurls collectively defining boundaries of a cylinder.
  • the term “lateral” as used herein with regard to the individual knurls refers to the direction perpendicular to the longitudinal plane that bisects that knurl.
  • axial and “longitudinal” refer to the direction parallel to the central longitudinal axis of the fastener shank that is cylindrical in nature.
  • the fastener of the invention 9 which has a head 11 being the largest diameter of the fastener.
  • the rows of knurls 15 extend substantially the entire length of the shank 13 and follow a zig-zag path along a longitudinal direction A-A.
  • all the rows are of the same radial height as depicted by the straight edge line 17 of FIG. 2 with a general triangular profile having straight sides and a peak 16 seen in FIG. 1 defining the maximum height of the row.
  • a seen in FIG. 3 fastener 20 like the embodiment of FIGS. 1 and 2 , has a head 21 of largest diameter of the fastener.
  • Each row of knurls 23 extends substantially the entire length of the shank 27 .
  • This fastener has eight straight longitudinal rows of knurls as shown by the straight longitudinal troughs 25 between each row.
  • the cross-section of each knurl row in its longitudinal plane consists of a series of contiguous arcuate peaks 22 and valleys 26 which define a wavy profile as seen in FIG. 6 .
  • the shape of the cross-section of that row is also wavy, comprising undulating wide and narrow arcuate portions as seen in FIG. 7 .
  • Each knurl has an arcuate smooth side surface, which appears to the eye as a raised hump or bump on the circumference of the shank.
  • each axial row of knurls has the same starting point to its wavy profile beginning at the end of the fastener shank. That is to say that the peaks and valleys of the rows are all in alignment longitudinally. Also, all points of a lateral cross-section perpendicular to the longitudinal axis of the shank through that row are symmetrical and identical for each knurl row.
  • FIGS. 4 through 7 show the same shape of the individual knurl rows as in FIG. 3 , but the fastener 30 shown in FIG. 4 has the eight rows of knurls longitudinally offset from one row to the other.
  • each row of knurls starts from the end of the shank longitudinally offset from its counterpart in the neighboring row so that the peaks 33 of one row are aligned longitudinally to the valleys 31 of the adjacent row.
  • each row of knurls is aligned along a straight longitudinal path shown by the straight intermediate trough 36 between the rows as also seen in FIG. 5 .
  • FIGS. 6 and 7 the wavy shape of the individual knurls in the FIGS. 3 and 4 embodiments is depicted.
  • FIG. 6 we see the wavy longitudinal profile of the arcuate peaks 33 and valleys 31 of the rows of the FIG. 4 embodiment. It is also clearly shown here that the peaks 37 of a next row are longitudinally aligned with the valleys 31 of the first row thus illustrating the offset nature of the adjacent rows. This is the distinguishing feature between the embodiments of FIGS. 3 and 4 .
  • FIG. 7 we see that individual knurls 43 of a row of either the FIG. 3 or FIG.
  • arcuate sides 41 which may be joined by intermediate arcuate narrow sections 40 , which follow along a straight longitudinal path.
  • the narrow intermediate sections may be eliminated if the valleys seen in FIG. 6 are deep enough to reach the shank.
  • the knurls appear to the eye as a plurality of round bumps extending radially from a generally cylindrical shank.
  • FIG. 8 we see a cross-sectional depiction of a knurl row from the same view as FIG. 7 that represents yet another embodiment.
  • the rows here are basically the same as that depicted in FIG. 3 except that rather than the individual rows following a straight longitudinal alignment as seen in FIG. 7 , the individual rows follow a serpentine path similar to the zig-zag pattern shown in FIGS. 1 and 2 .
  • the shape of the knurls 53 is defined by arcuate sides 51 joined by intermediate narrow sections 50 .
  • the narrow sections may not occur and thus not appear from this view if the valleys as seen in FIG. 6 are so deep that they meet the surface of the shank from which the knurls protrude.
  • the fastener can be composed of any material suitable for its function and there may be more or fewer than the eight rows of knurls depicted in the embodiments shown. There may be many other variations on the embodiment depicted herein that do not depart from the spirit and scope of the invention, which shall be determined only by the claims and their legal equivalents.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)
  • Insertion Pins And Rivets (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Earth Drilling (AREA)
US16/185,048 2017-11-14 2018-11-09 Press-in fastener with a wavy knurled shank Active US10704581B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/185,048 US10704581B2 (en) 2017-11-14 2018-11-09 Press-in fastener with a wavy knurled shank

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762586083P 2017-11-14 2017-11-14
US16/185,048 US10704581B2 (en) 2017-11-14 2018-11-09 Press-in fastener with a wavy knurled shank

Publications (2)

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US20190145450A1 US20190145450A1 (en) 2019-05-16
US10704581B2 true US10704581B2 (en) 2020-07-07

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US (1) US10704581B2 (zh)
EP (1) EP3710712A4 (zh)
JP (1) JP7315548B2 (zh)
CN (1) CN111344498B (zh)
CA (1) CA3082258A1 (zh)
MX (1) MX2020004943A (zh)
SG (1) SG11202004424YA (zh)
TW (1) TWI804524B (zh)
WO (1) WO2019099287A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210396266A1 (en) * 2020-06-22 2021-12-23 Illinois Tool Works Inc. Insert screw sleeve, connecting bolt, bolt-sleeve combination, and component therewith

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11486520B2 (en) * 2019-07-25 2022-11-01 Newfrey Llc Press-fit, friction-retention coupling assembly between hard, inflexible material components

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US2015159A (en) 1928-06-04 1935-09-24 Rosenberg Heyman Fastener
US2191771A (en) 1937-09-16 1940-02-27 Illinois Tool Works Fastener
US2269708A (en) 1940-01-22 1942-01-13 Robert B Dickson Fastening element
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US4776739A (en) 1986-04-14 1988-10-11 Illinois Tool Works Inc. Plastic drive fastener
US5340254A (en) * 1992-01-31 1994-08-23 Textron Inc. Thread forming screw for forming an internal thread in a low ductility material
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Publication number Priority date Publication date Assignee Title
US2015159A (en) 1928-06-04 1935-09-24 Rosenberg Heyman Fastener
US2191771A (en) 1937-09-16 1940-02-27 Illinois Tool Works Fastener
US2269708A (en) 1940-01-22 1942-01-13 Robert B Dickson Fastening element
US3477334A (en) * 1967-11-02 1969-11-11 Phillip D Stone Nail
US4776739A (en) 1986-04-14 1988-10-11 Illinois Tool Works Inc. Plastic drive fastener
US5340254A (en) * 1992-01-31 1994-08-23 Textron Inc. Thread forming screw for forming an internal thread in a low ductility material
US5489179A (en) * 1994-08-19 1996-02-06 Illinois Tool Works Inc. Fastener and building assembly comprising workpiece, substrate, and fastener
US5741104A (en) * 1994-08-19 1998-04-21 Illinois Tool Works Inc. Steel fastener having grooved shank
US5749692A (en) * 1994-08-19 1998-05-12 Illinois Tool Works Inc. Fastener with polymer-coated shank
US5907891A (en) 1998-02-24 1999-06-01 Illinois Tool Works Inc. Tree fastener with split wings
US6340277B1 (en) * 1998-12-11 2002-01-22 Ejot Verbindungstechnik Gmbh & Co Kg Self-tapping screw
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US7807911B2 (en) * 2004-03-17 2010-10-05 Yamaha Corporation Keyboard musical instrument having keys equipped with balancers biting into keys and method for securing balancers to keys
US8858144B2 (en) * 2007-03-06 2014-10-14 Dale E. Van Cor Threaded fastener and fastener system
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210396266A1 (en) * 2020-06-22 2021-12-23 Illinois Tool Works Inc. Insert screw sleeve, connecting bolt, bolt-sleeve combination, and component therewith

Also Published As

Publication number Publication date
MX2020004943A (es) 2020-08-27
WO2019099287A1 (en) 2019-05-23
CN111344498A (zh) 2020-06-26
JP7315548B2 (ja) 2023-07-26
CN111344498B (zh) 2022-05-13
US20190145450A1 (en) 2019-05-16
JP2021502841A (ja) 2021-02-04
EP3710712A1 (en) 2020-09-23
EP3710712A4 (en) 2021-08-25
CA3082258A1 (en) 2019-05-23
TWI804524B (zh) 2023-06-11
SG11202004424YA (en) 2020-06-29
TW201925634A (zh) 2019-07-01

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